From owner-freebsd-stable@FreeBSD.ORG Mon Oct 22 12:29:44 2007 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 78A2016A469; Mon, 22 Oct 2007 12:29:44 +0000 (UTC) (envelope-from oleg@vsi.ru) Received: from serv4.vsi.ru (serv4.vsi.ru [80.82.32.19]) by mx1.freebsd.org (Postfix) with ESMTP id E965713C491; Mon, 22 Oct 2007 12:29:43 +0000 (UTC) (envelope-from oleg@vsi.ru) Received: from delloleg (dell-berry.vsi.ru [88.83.197.200]) by serv4.vsi.ru (8.13.8+Sun/8.13.8) with SMTP id l9MCTX2P008530; Mon, 22 Oct 2007 16:29:38 +0400 (MSD) Message-ID: <027d01c814a7$35e408d0$c8c55358@delloleg> From: "Oleg Derevenetz" To: "Alfred Perlstein" References: <027d01c8125c$73d4db80$c8c55358@delloleg><20071019220501.GL31826@elvis.mu.org><006d01c8133a$674a90b0$eec55358@W2KOOOD> <20071020192601.GW31826@elvis.mu.org> Date: Mon, 22 Oct 2007 16:29:32 +0400 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 Cc: freebsd-stable@freebsd.org Subject: Re: kern/104406: [ufs] Processes get stuck in "ufs" stateunderpersistent CPU load X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 22 Oct 2007 12:29:44 -0000 >> > > Can anyone take a look on PR kern/104406 ? I got repeatable hang >> situation, >> > > but I can't obtain a kernel dump to get result of all show commands from >> > > here: >> > > >> > > >> http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug-deadlocks.html >> > > >> > > After my break to debugger using Ctrl+Alt+Esc sequence and entering a >> > > "panic" command kernel does not wrote a kernel dump but seems to hang. >> Can >> > > anyone describe how to obtain a kernel dump in this situation, or at >> least >> > > say - which output of show commands need in first place to debug this ? >> > > Output of all suggested commands is huge and I afraid of making mistake >> > > when carrying this output from screen to list of paper and back :-) >> > >> > Oleg, one thing you can do to make this less painful is to >> > run your machine's console over serial port. >> > >> > First get a crossover serial cable, make sure it works from one >> > box to another, it should be easy to run "tip com1" on both >> > boxes to ensure that it works. >> > >> > Then you just need to add console=comconsole to /boot/loader.conf >> > and your box's console should come over serial. >> > >> > Then on the machine watching the console, you can just do this: >> > >> > % script >> > Script started, output file is typescript >> > % tip com1 >> > ...do ddb stuff now... >> > ...stop tip >> > % exit >> > >> > now you should have everything logged into a file called "typescript" >> > should save you a big headache. >> >> Thanks, I'll try it in the monday morning. I posted a followup to kern/104406 that includes all information listed in "Debugging Deadlocks" chapter of FreeBSD Developer's Handbook. Can anyone take a look on it and say - is this certainly a hardware problem or some sort of software problem ? -- Oleg Derevenetz OOD3-RIPE Phone: +7 4732 539880 Fax: +7 4732 531415 http://www.vsi.ru CenterTelecom Voronezh ISP http://isp.vsi.ru